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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdbb19becde490de2a52c5d96c3185f1301e9f29db4d6e5bc44bfdff0d261318' 
  AND token = 'Gb4AN1/bDbymid7GnyZt0jJaFOPgfKcf8gD2YOV6BKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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