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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '675e8ae6a0f3111bd33f625afc224e0bb44c3f38cf6cf4f308e10dfd03b88e65' 
  AND token = '79X6OmMHb6o7VMnQiGEMAKcLkiLjfU8JYC5B+vCNiWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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