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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c00a4e87e9e694745656878f21dc7670b197c4093d8ca9a5b0301874155360a5' 
  AND token = 'I0fotndhwfXx7btTeU4KHFUQCBpkKra+jnzrTtu2JK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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