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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68abec2f689cefa97c7ae426d1f28a08a989c1656e0cbe04a34647910e55f8fc' 
  AND token = 'gSnOulWZomC1E0jdU4D0yeUUIxNu2jpwhIPE0uG3J90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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