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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6d4d094cd136d92d0c77094eb3a219daae2eaa25ab09cc1d6b56ded2f9b3759' 
  AND token = 'QPlxNoqRsClWeJly2EZkeUKKrl813zeljj1g0x1WTEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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