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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '684a3b13e8d6cd47694a22e9524617effec2d1453a50973ea49362a672199833' 
  AND token = '3Ol9SzloFJdB7XPAulhr9qcq0mD08iNl9B64qJlOEOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00100

JSON explain

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