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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab716fb77ba290f748c46caeaa09137c2a990b28389987f221aa965dd9a5f6f3' 
  AND token = 'mrqDbSf72zB6x1n+5oZqIDqvogC4ghqBfSYva4T6khI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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