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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dec19205991d22d94222f87c552b663f162267a2b67504a4ffa1ca8881dd09d2' 
  AND token = 'BW2j7Rsgxfa19yUauWWwsIS6t2ddS7h13KRLhMOU3dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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