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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5191fd8b2087619d0191feeac68f2360a5402c25f5ef0bae96456138cc6b7010' 
  AND token = '98sFhLweoQ5vFGb0ztFgCJla8ZGOERzi8o9r3wiJeRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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