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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1b029862a9e2b00555e372b27c679fc1a22600e4ed25d394777a8191f2a4ee7' 
  AND token = 'GSnCHJAPFMHaHgwPPRAaC2ord//jFRhzxQXit4/0XGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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