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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '487f85313cda3ed798044ad51e2e36dc0c4a5d04e00159ba6250ac5512a18d8a' 
  AND token = 'bm88ShzLqpKyuiPcrNlJ+fWa7OWRsgTT7p3aU3RN1nM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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