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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de5ac8992bab40a9801f5028e106d1a50dda7b8faa4b74da0397f7fb4ff23d90' 
  AND token = 'f+kyCxy0UENLncEdNtw2bXeN3IpDDdHx3DFUeJEpMmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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