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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cca6fc12d01d7a1bf5ce04ceebadef348a0fd6fea94a345ff5169740dd76119' 
  AND token = 'ysAtRoUAHA4XXu1sDbeqY98dl8BnPfQxE0D5YohwW/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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