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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '136efb8d23ab1b9823e604e38e7947ae5346b9e9b396d9593285a9fe36cb8604' 
  AND token = '0hR+P25nZAKELIL/r32IpYeSY0IZ1jtwFWs/1VKs8Jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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