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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4da4fabe6c2228072cf4c6c9553118435463f4f94a0b40d86a05e69ea7707edb' 
  AND token = 'puAdevszg3cVIJ7/iZiALZW3okSi44vWbyoAy7xCIUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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