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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e280bcfd6c81ca797152f9d3c7f9f07a0063977acae32e24412e475c3becfec7' 
  AND token = 'iqPkbmHcebhDc8Vgif3AUQPVNIfeH547iWINgQhP2nI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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