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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c7773f0563bc82ca2d24ca41a3812188143983a143f6d0364491623f6a7992c' 
  AND token = 'GwQG+roXFn+7kZIX2SMqmmQvh5lsuVh220o+OMmxcrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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