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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec11e32fa72eaad26ea2f13b0ec5c0a9d500f2460db2a486ecb17f69e0e2eeb7' 
  AND token = 'ojGjGOUaVso4d9IW9UvUfClfgD0EPKMAhfc1O777K5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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