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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3a2f1f20110a9fb3b30bf16668e83a295e5b4305fcf169a99eaa29d2920f7f2' 
  AND token = 'qCm+roT7IqbQ9JKi0oCu1TKtby8RFCwyRTOYJmpGXgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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