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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b4aeefbc3a53e5f1ac1d811b5323888b0675f06f91262df0a7b72a700e0decc' 
  AND token = 'FWI4amAGpbfW15zLmY2bB2LOl6CYLxdyI2SgFzR1KS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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