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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '751ce70ebffdc8a842efe6860c58fb03c62f59afdacb193cc8642c408585fe8a' 
  AND token = 'iBXvEvnxstoD0SavRWHVghcy/flHvQLbc/RcOzJ+aAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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