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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bc8c35b12779dd5d1e86ded7c9aca2bc6e9bbc63e367231d43ce5725389f21a' 
  AND token = '3gbpbFnVyHml2snrOFcuTX/IDnbLQoO6nGwOKLADtas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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