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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a637259721aba56b4120cf51d38a4926d9fe516865ac694e7307a3cdb1cc1c6e' 
  AND token = 'TbRzPURbUjlNiJ0ol4JB2TVD6VYI8kYfPTWzhS09dXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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