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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9665100d68ed8c6db3280f8392aed33468fec3ab862a0f08de45fb2a3b04504b' 
  AND token = '3Lge8BPfGtbcmECGMcW4SoghAlCfYf4ktwdkrydC+LE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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