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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '391e6e455427dbe938eda5c727841e8aaf5e9d41febd7c0c11a1115519eec8e3' 
  AND token = 'q96IFBUwQy6EISTU9VMWjr6m0BB0IM7xyAZhWLOrSKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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