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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8798e1f577a2e35212dd662e9e7bec8e5afb62ab5c3c608eed4a39d2ccac66dd' 
  AND token = '7rEMt/Ik6sn6csfCep5OSs7/xv1z13MR61Sa7Jhoybk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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