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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7677a57b9ed55b8a29cd0732d9f760bb1d91e7249ac03268121222fdccf049d3' 
  AND token = 'yfcXYzQXSN4VoA1Tf2QiMojDu7rjYKXOoOdO1x14JhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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