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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7a09fd27eff2b211ad7e74b21f0d7f4d720b2007dccc6877d03195502427d7f' 
  AND token = 'visxG0+NHBkg9VBBQIfkPIfHqL9QVMNtBUXIjgMGnZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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