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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fd4bc030e3882d2ddf58c8f5c33ddcf2ec958f2f5aa4e2dd68c9feaed6f90f5' 
  AND token = 'iPKq40wYPNsIFj6vkfozkPIkskGjNxK1tRcLIsXwhKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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