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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa77cfec1035c1bda239d8ac848e33fd974b1cc14c3069be13a7c67e9b15c3ea' 
  AND token = 'CdQUzpNnwi6/i3yy2M23yi7RhOsR0vrqToIeIAFnz60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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