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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90b80d4e4172a33c8d66386455e8f4e4896f8ca1173d1b5767aeb7a714be6c82' 
  AND token = 'R9zxliSLeMyfUiqTZDQ7kZbKZN1wvlaGyEDjilGakMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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