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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e68a95e04a48e51b3777d3f260b63d0fd2c86584d4eb3b2a856dedd5218219f6' 
  AND token = 'M4N6wTPrFXjgMRYJS56+x5tu64vVIxr1PZgq8eP1axE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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