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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d420cd276e667d6d06a792b3051d0b6f8fcd91d5a9079e7ded407758613e7ab' 
  AND token = 'GvEMMTW4UhybXBt6PAJTwVxauU2r1az7wjs9suO+yP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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