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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b64ef2d6ccc45bf2e0802bf5ce34d9f31a41337ad83bb3ace45dcf7c11e47a50' 
  AND token = 'l/mU87/FcqDz5xV2h2AC0mdKfye2gn/gnrBuNy6cer8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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