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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bcb492e3eca4dd50fdb9b093c1a7747e19f5e86c93390e3322d88fc3a97197c' 
  AND token = 'vajWtwvuQWA3IOyIZ41H18fUUnRm2V7zxYmfyLoADiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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