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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '342c76277243bba881c2a2b716c36d06a0ab0b487b07c87712f927209d07cf0e' 
  AND token = 'qOsCbc+FLMyVCE+x3/MNwg9A5ueyKP/nFLV5qJWS8Z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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