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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe3e1b43d228a3a4acf1a33a8c76dfb13639dbab6dcd1a8fb14548bfde620059' 
  AND token = 'ndeJ+fcsjG5ldfIlPnT7O8CsXau2OTWs156fiAK0/as=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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