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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7108d1a4096267d01d674857d9747612db470e0cc96201caf8180c08dbb6ae96' 
  AND token = 'VvvVUfq90ChhL3ruo8X2t2lOSUywyFeP414HpZyQsPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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