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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c28b443faf170b3ff6961dcd6c36a2ce2ca1c78c138f89404e91dd6d12e423e3' 
  AND token = 'JeX+GP5V4KeZ4hW0LGJDrGW3cWHZa/q7lN1LIsxv6LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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