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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d0d89cbfe2b9ba633e6305e40212d52ad2ea7572a68cb0d80b43c5240fb72fa' 
  AND token = 'YYXi/Cn173rqaekTcb0shJfP3XZAEpgmnQqiSNhN0tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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