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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '603a22638e64b860e967643ec61ed33b9338f522ce5ed3a360e536be7bf30464' 
  AND token = 'X1ATfNlUqKJ3LXERvsTINRF2I7p/McbkrhhpC2DZEso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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