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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10cd7c567c55895e04386d0b4bc851de502dd1073ed4a56eada4bf5fb39c21a5' 
  AND token = 'c27RarW4ADACDmhl+grkj3gVHm96KqsZwLAplu+78+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}