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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '900c0c4cde6ab30abc71c323f84a37b9d2d2ec5c917ec89908087d007d8cb66b' 
  AND token = 'XLHtCSQKADB0wD6Xso/5+VL0N03bW43RMyuviuTnca8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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