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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebb9a4d60cae40cbe43311fa6a78bd5daf70cab3d81dca1349e727d10d8279c0' 
  AND token = '34EPlUI43dHxSZd39H3ktC4e4Lb5KKiJe43wNetc/yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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