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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0985fef0d3991475b86333b90d7f765d25ec2ff572b411ed578bd8d13a4ca81' 
  AND token = 'cWmaYj00NG8TwE93jgJ8o8WbjohRWuI5bnUTusEQvr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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