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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e536a8b84c5772dd6c1330eb8c82b4386cf9a1e42722487611c2da3123d67d7' 
  AND token = 'YMxxH88ROW+9o940A4hV4h6LThCnA/Egua5ByVqeJUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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