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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c15859e91f46c4200eda305cec92b5e15679efed4534beb32c7c0acaffac9630' 
  AND token = 'sN7ZUf9wTim8ayivZm4uITyZ2d50T0orkdSOjuCH1do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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