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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd526cb1f46ce0c990055e1de7b2b8cb2089b755aa4d66930dd22ceee30e44c68' 
  AND token = '+S5FlkUzF4Q06gbHef0NaEHdX0rEQP4vYc3U4edD0pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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