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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '817d062da6f5122af9726c921cdf5ea3527ed83aa8bb24c770e9e1facadce963' 
  AND token = '5rDfeiq5emrZJTQ4bq54l04r6M1B7JWhJIGvtZNINGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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