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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba113e03e1a5769d5de2f6d75d17837c854a27b3b17f0d640d1e24bda211de08' 
  AND token = 'x5lHA5n+qYtmOh0bUgteviiRDcAFCtaypQu898N1ns0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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