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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b83da837f95c254d33a8107c9e42851e0fe0828db451e0922e14e9c1fec54381' 
  AND token = 'CVVCrK1RjHA3C1V3gfmHJxwprebztafpvDEuiH/bq50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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