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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b01fb01879ab894952d305c0c326322280ec13b1a1b34c62d8d7a76549132071' 
  AND token = '4nyuxEjYKxITXiRhLeFt5TKhSIUGit0VZu3kWiH7Yyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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