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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffc3e35485be9fd539284aa414eed2e6feefafafbbfacdd0f72d8a96f6fd8287' 
  AND token = 'hCZ/evXFeC4zog6kBvsmsjEFlUmV+1Tbz51e1XFntBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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