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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '482bd3bf6516ee407851c7eabbec18e3092ea16d62557f6eface2c49eb4d8054' 
  AND token = '4gTCSSvh+CvX4xurk0SdJKcHS6urjX2uRpXd2iIobVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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