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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2ba87e3bec1b50185febb0d30395900e6a56f0f710c639928227a15f4d73715' 
  AND token = 'OZCoWo9lByGNnB3rk/s/5ixC6MhpA9c8EUSyHXYSF18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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